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32 = 3x + 7 + 2x + 5
20 = 5x
4 = x
panjang = 3x + 7 = 3 x 4 + 7 = 12 + 7 = 19 cm
lebar = 2x+5 = 2 x 4 + 5 = 8 + 5 = 13 cm
64 = 2 ( ( 3x + 7 ) + ( 2x + 5 ) )
64 = 2 ( 5x + 12 )
64 = 10x + 24
10x = 64 - 24
10x = 40
x = 4
3x + 7 =
12 + 7 = 19 cm.